US Bridges

31st ST over Salt Creek

Fair

Cook County, Illinois · 1.7 M E US 45 · Structure no. 016272500000000

Built
2001
24 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
146 ft
2 main spans
Daily traffic
14,300
2023 count
Owner
State
State Highway Agency

About this bridge

31st ST over Salt Creek is a steel continuous stringer/multi-beam or girder carrying 31st ST over Salt Creek in Cook County, Illinois. It was built in 2001, so it is 24 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 14,300 vehicles a day, roughly 3% of them trucks, projected to reach 12,524 by 2046. The structure is 146 ft (44.5 m) long and 70 ft wide.

Location

Open in Google Maps
Carries31st ST
CrossesSalt Creek
Location1.7 M E US 45
CountyCook County
StateIllinois
Coordinates41.83509, -87.84307
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.6 US tons
Inventory rating56.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length146 ft (44.5 m)
Longest span73 ft (22.3 m)
Deck width70 ft (21.4 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,300 (2023)
Projected traffic12,524 by 2046
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 31st ST over Salt Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is 31st ST over Salt Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does 31st ST over Salt Creek carry?

About 14,300 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is 31st ST over Salt Creek?

The structure is 146 ft (44.5 m) long with a longest span of 73 ft (22.3 m) and a deck 70 ft wide.

Who owns 31st ST over Salt Creek?

It is owned by the State Highway Agency.